SIMT(NRC) versus SIMT(IBM) via Common-View GPS
1 Day Averages 1 Hour Averages 10 Minute Averages Next Date Last Date Flip    

Laboratory 1National Research CouncilID Number008End Date2021-09-13
Latitude 45° 27 min 14.853 s NCounter Delay 0.72 nsReference SourceSIMT(NRC)
Longitude 75° 37 min 25.777 s WREF Delay 38 nsMask Angle10°
Altitude82.59 mReceiver Delay229.3 nsReceiver Temp.34 °C
Laboratory 2IBMETRO Bolivia ID Number025Baseline6568.506 km
Latitude 16° 30 min 1.070 s SCounter Delay 0.01 nsReference SourceSIMT(IBM)
Longitude 68° 7 min 56.998 s WREF Delay 2.9 nsMask Angle10°
Altitude3648.75 mReceiver Delay103.0 nsReceiver Temp.41 °C

Hours in
Common-View		 Mean Time
Offset (ns)		 Range (ns) Frequency Offset Confidence (r)
24 67.36 14.06 +4.52 x 10-14 +0.29




Allan Deviation
Averaging Period ()
(hours, minutes)		 Samples Frequency
Stability
0 h, 10 min 141 9.00 x 10-12
0 h, 20 min 139 5.47 x 10-12
0 h, 40 min 135 3.50 x 10-12
1 h, 20 min 127 1.96 x 10-12
2 h, 40 min 111 7.60 x 10-13
5 h, 20 min 79 3.99 x 10-13


Time Deviation
Averaging Period ()
(hours, minutes)		 Samples Time
Stability (ns)
0 h, 10 min 141 3.12
0 h, 20 min 138 2.96
0 h, 40 min 132 3.30
1 h, 20 min 120 3.28
2 h, 40 min 96 2.10
5 h, 20 min 48 2.53


SIMT(NRC) - SIMT(IBM)
(common-view tracks from individual GPS satellites)
GPS
PRN		 Minutes
(In-View)		 Minutes
(Common-View)		 Range (ns) Time
Deviation		 Frequency Offset Confidence (r) View
Detail
1 350 130 21.05 2.27 +1.99 x 10-12 +0.79 View
2 370 90 14.43 3.65 +1.64 x 10-13 +0.26 View
3 430 30 9.64 0.00 -6.41 x 10-12 -0.75 View
4 350 120 14.10 1.86 -1.67 x 10-12 -0.89 View
5 320 70 10.34 3.39 +3.59 x 10-13 +0.12 View
6 340 60 20.81 4.91 +1.54 x 10-12 +0.28 View
7 320 140 15.51 1.29 -1.99 x 10-12 -0.94 View
8 320 170 27.11 2.10 +2.05 x 10-12 +0.92 View
9 430 70 28.78 2.15 +5.43 x 10-12 +0.71 View
10 360 130 18.20 2.59 +2.28 x 10-14 +0.09 View
11 --- --- ---------- ------- -------------- ------ ----
12 460 40 14.90 0.00 +2.50 x 10-12 +0.43 View
13 360 120 23.88 3.68 +3.21 x 10-12 +0.91 View
14 360 160 54.06 4.85 -4.86 x 10-12 -0.91 View
15 320 170 28.53 1.00 +3.32 x 10-12 +0.98 View
16 340 150 25.49 1.59 +2.83 x 10-12 +0.96 View
17 230 50 11.72 5.56 +2.82 x 10-13 +0.38 View
18 340 140 22.85 1.05 -3.21 x 10-12 -0.98 View
19 360 110 27.81 4.88 -2.39 x 10-12 -0.68 View
20 360 170 21.85 1.79 +2.16 x 10-12 +0.92 View
21 380 110 22.38 1.76 +3.16 x 10-12 +0.97 View
22 390 50 10.84 5.83 -3.47 x 10-12 -0.63 View
23 320 150 28.05 2.43 -2.48 x 10-12 -0.84 View
24 330 90 26.95 0.93 +5.40 x 10-12 +0.99 View
25 340 90 22.53 5.43 +1.91 x 10-12 +0.57 View
26 330 160 21.93 1.60 -6.51 x 10-15 -0.03 View
27 360 140 23.57 1.45 +2.72 x 10-12 +0.97 View
28 --- --- ---------- ------- -------------- ------ ----
29 410 80 18.08 1.77 -3.87 x 10-12 -0.96 View
30 390 110 14.28 1.44 -2.29 x 10-12 -0.92 View
31 370 70 13.41 0.81 +2.25 x 10-12 +0.92 View
32 380 120 15.55 2.66 +7.26 x 10-14 +0.57 View


Legend
GPS PRNThe unique pseudo random noise (PRN) code (1 to 32) used to identify each satellite. If no satellite is assigned to a given PRN code, then no data are shown.
Minutes
(In-View)		The number of minutes when the satellite was visible at laboratory 1. During this period, the time difference between the satellite clock and the laboratory reference is measured every second, and 10 minute averages are stored. Since data is recorded in 10 minute segments, the values are even multiples of 10 minutes.
Minutes
(Common-View)		The number of minutes when the satellite was visible at both sites involved in the common-view comparison.
RangeThe difference between the maximum and minimum time offset values (nanoseconds).
Time
Deviation		The time deviation (TDEV) of the 10-minute averages (nanoseconds).
Frequency
Offset		The estimated frequency offset of laboratory 1 relative to laboratory 2 based on a common-view observation of the satellite. This estimate is obtained by fitting a least squares line to all of the recorded data.
Confidence
Level (r)		The confidence level of the estimated frequency offset. The confidence level is the correlation coefficient (r) of the least squares line fitted to the data.
View
Track		Clicking on the View link displays a common-view track from the selected satellite. The number of previous days shown equals the number of previous days shown on this page, up to a maximum of 30 days.